Detroit police officer Deon Nunlee is accused of sexually assaulting a 31-year-old woman who called 911 to report being attacked by her boyfriend.

Nunlee faces three counts of second-degree criminal sexual conduct and one count each of assault with intent to commit sexual penetration, and misconduct in office, reports the Detroit Free Press.

Prosecutors allege that Nunlee and his partner responded to a domestic disturbance complaint at a home on Detroit’s northwest side at around 3 a.m. on October 30, 2013.

A woman claims that after the officers arrived, one remained downstairs with her boyfriend while the other took her upstairs to a bedroom. She says the officer then assaulted her in the bedroom, and told her he would return later that morning, according to the Beaumont Enterprise.

Nunlee did not return.

Police Chief James Craig said Nunlee was connected to the assault through DNA evidence.

"This is the type of misconduct that should never happen," Craig said. "This does not reflect the work the Detroit Police Department does each and every day."

The assault was reported to police the next day by the woman.

Nunlee’s partner is not being charged in the case and is believed to have done nothing wrong, says Craig.

Craig stated it is common to separate parties at domestic dispute situations, and keep them at a safe distance. But in this case they were in different areas of the home.

For officer safety, Craig said, “an officer should never lose line of sight of their partner.”

Nunlee has not denied the allegations, but chose to remain silent after being read his Miranda rights.